- a period of 30 minutes.
- the midpoint between the hours: The clock struck on the half-hour.
- of, relating to, or consisting of a half-hour: half-hour programs.
- a period of 30 minutes
- (as modifier)a half-hour stint on the treadmill
- the point of time 30 minutes after the beginning of an hour
- (as modifier)a half-hour chime